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CAUTION: IF BUILDING COLD WATER SUPPLY HAS A BACK-FLOW

PREVENTER, CHECK VALVE OR WATER METER WITH CHECK 

VALVE, PROVISIONS FOR THERMAL EXPANSION OF WATER IN 

THE HOT WATER SYSTEM MUST BE PROVIDED.

FIGURE 3.

CIRCULATING RETURN LINE CONNECTIONS

TEMPERED WATER LOOP, IF USED, CONNECT TO POINT "A".  

STORED TEMPERATURE WATER LOOP, IF USED, CONNECT TO 

COLD WATER INLET

WARNING

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE 

USE TEMPERATURE AT FIXTURES.  SEE TEMPERATURE 

REGULATION ON PAGE 11.  IF HIGHER PREHEAT 

TEMPERATURES ARE NECESSARY TO OBTAIN 

ADEQUATE BOOSTER OUTPUT, ADD AN ANTI-SCALD 

VALVE FOR HOT WATER SUPPLIED TO FIXTURES.

SINGLE TEMPERATURE

VENTING

 WARNING

THE INSTRUCTIONS IN THIS SECTION ON VENTING MUST BE 

FOLLOWED TO AVOID CHOKED COMBUSTION OR RECIRCULATION 

OF FLUE GASES.  SUCH CONDITIONS CAUSE SOOTING OR RISKS 

OF FIRE AND ASPHYXIATION.

This water heater must be protected from freezing downdrafts.

Remove all soot or other obstructions from the chimney that will retard 

a free draft.

Type B venting is recommended with these water heaters. 

This water heater must be vented in compliance with all local codes, the 

current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54, 

and with the Category I Venting Tables.

In Canada, venting shall conform to the requirements of the current 

edition of the CAN/CSA B149.1-00 installation code.

If any part of the vent system are exposed to ambient temperatures below 

35 degrees F (2 degrees C) it must be insulated to prevent condensation.

•  Do not connect the heater to a common vent or chimney with solid 

fuel burning equipment.  This practice is prohibited by many local  

building codes as is the practice of venting gas fired equipment to 

the duct work of ventilation systems.

•  Where  a  separate  vent  connection  is  not  available  and  the  vent 

pipe from the heater must be connected to a common vent with an 

oil burning furnace, the vent pipe should enter the smaller common 

vent or chimney at a point above the large vent pipe.

FIGURE 2.

VENT CONNECTION

Vent connections must be made to an adequate stack or chimney. Size 

and install proper size vent pipe.  Do not reduce pipe size to less than 

that of the blower outlet.

Horizontal runs of vent pipe must have a minimum upward slope toward 

the chimney of 1/4 inch per foot (2cm per meter).  Dampers or other 

obstructions must not be installed in between the heater and the blower.  

Be sure that the vent pipe does not extend beyond the inside wall of 

the chimney.

Where a continuous or intermittent back draft is found to exist, the 

cause must be determined and corrected.  A special vent cap may be 

required.  If the back draft cannot be corrected by the normal methods or 

if a suitable draft cannot be obtained, a blower type flue gas exhauster 

must be employed to assure proper venting and correct combustion.

MIXING VALVE APPLICATION FOR TWO TEMPERATURE WATER

VACUUM RELIEF

       VALVE

*INSTALL PER 

LOCAL CODES.

Summary of Contents for BBCN375T754NV 100 Series

Page 1: ...AL ULTRA LOW NOx GAS WATER HEATER Glass Lined Tank type Water Heater INSTALLATION OPERATION SERVICE MAINTENANCE LIMITED WARRANTY CAUTION TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELATIVE T...

Page 2: ...Canada Current edition of the Installation Code CAN CSA B149 1 and the Canadian Electrical Code CSA C22 1 These are available from Canadian Standards Association 8501 East Pleasant Valley Road Clevel...

Page 3: ...r and Igniter 12 Checking Gas Input 12 Vent System 12 Blower Maintenance 13 Relief Valve 13 Hot Water Odor 13 Winter Protection 13 Replacement Parts 13 PREVENTIVE MAINTENANCE 13 14 Procedure for Perio...

Page 4: ...gas in excess of the safe limits This could result in serious injury or death Contact your local gas supplier for any specific changes that may be required in your area Upon completion of derating of...

Page 5: ...THROUGH THE CHIMNEY OR VENT PIPE The venting of the water heater should be inspected by a qualified service technician at the time of installation and periodically thereafter to ensure a down draft c...

Page 6: ...t of the vent system are exposed to ambient temperatures below 35 degrees F 2 degrees C it must be insulated to prevent condensation Do not connect the heater to a common vent or chimney with solid fu...

Page 7: ...E LOCATION TO AVOID SCALDING OR WATER DAMAGE THIS LINE MUST NOT BE REDUCED FROM THE SIZE OF THE VALVE OUTLET AND MUST NOT CONTAIN VALVES RESTRICTIONS NOR SHOULD IT BE LOCATED IN FREEZING AREAS DO NOT...

Page 8: ...having jurisdiction AN ELECTRICAL GROUND IS REQUIRED TO REDUCE RISK OF ELECTRICAL SHOCK OR POSSIBLE ELECTROCUTION If any of the original wire as supplied with the appliance must be replaced use only t...

Page 9: ...matic gas valve while heater is operating TABLE 5 Type of Gas Input Manifold Pressure Natural 75 100 Btu hr 22 KW hr 4 0 in W C 1 12 kPa OPERATION It is recommended that a qualified person perform the...

Page 10: ...as been under water OPERATING INSTRUCTIONS A Set thermostat to the lowest setting B Turn off all the electric power to the appliance if service is to be performed TO TURN OFF GAS TO APPLIANCE BEFORE O...

Page 11: ...akage corrosion and other deficiencies which could cause an unsafe condition 3 So far as is practical close all building doors and windows and all doors between the space in which the water heater s c...

Page 12: ...rn doors windows exhaust fans fireplace dampers and any other gas burning appliance to their previous conditions of use 7 If improper venting is observed during any of the above tests the venting syst...

Page 13: ...anode as necessary to maintain corrosion protection For further information contact your dealer WINTER PROTECTION In regions where freezing weather is encountered all water must be drained from unit...

Page 14: ...the Flo Jug kit This screw is to be installed in the vent hole when Flo Jug is not in use Remove drain valve from heater and insert a 3 4 x 4 nipple Connect and clamp 1 I D x 3 hose to Flo Jug and hea...

Page 15: ...idence of poor vent action Possible causes are too long a vent pipe or improper chimney operation 3 If the leakage is from the temperature and pressure relief valve or its discharge pipe it may repres...

Page 16: ...information and tables may serve to answer your question about a problem that you are having without having to call a service agent For your safety water heater service should be performed only by a q...

Page 17: ...a qualified person for service 3 Thermostat problems A Thermostat set too low Set temperature control higher B Thermostat or ECO defective Replace gas control valve thermostat C High limit control ci...

Page 18: ...control does not energize the blower replace the Intelli Vent control If the blower fails to Blower may run continuously in start when energized replace the blower assembly this condition 2 Ensure the...

Page 19: ...ff for 10 20 seconds then on again to clear this error code 4 Ensure the flame sensor is clean use ultra fine steel wool or Scotch Brite pad to clean flame sensor 5 Ensure the hot surface ignitor is p...

Page 20: ...in tolerance 1 Ensure air pressure switch hose is not kinked or clogged ensure the blower housing is clear of any condensation 2 Check vent temperature limit switch if it is determined that the vent t...

Page 21: ...21 NOTES...

Page 22: ...22 NOTES...

Page 23: ...hod of controlling thermal expansion is also installed at the heater s and operational at all times The relief valve installed on the heater is not an acceptable method 4 SERVICE AND REPAIR EXPENSES U...

Page 24: ...nson City TN 37605 Phone 800 456 9805 Fax 800 999 5210 www americanwaterheater com Copyright 2012 American Water Heater Company All rights reserved www americanwaterheater com American Water Heater Jo...

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